Explain reflection of plane wavefront from concave mirror.

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Gujarati

Hindi

10.Wave Optics

hard

Explain the reflection of plane wavefront from concave mirror.

Option A

Option B

Option C

Option D

Solution

These depicts the parallel incident of rays and reflection on the incoming concave mirror and the rays focus near the focal point $\mathrm{F}$.

The wavefront $X Y$ of incident ray and wavefront $X^{\prime} Y^{\prime}$ of reflected ray are also shown in figure.

Here point $b$ corresponding to the reflected rays is left behind relation to $a$ and $c$.

Because the rays at the pole $\mathrm{O}$ of the mirror have taken less distances than the rays reflecting from the edge of the mirror. Thus it is little late reflection occur at $\mathrm{O}$ and hence point $b$ remains behind the other points on the reflected wavefront.

Standard 12

Physics